Steam-boiler.



' PATENTED JULY 2, 1907.

H. G. VOGT. STEAM BOILER.

APPLIOATION FILED 1123.2. 1906,

HENRIK CHRISTIAN VOGT, OF COPENHAGEN, DENMARK.

STE-BOILER.

- To all whom it may concern:

Be it known that I, Hnmux CHRISTIAN Voe'r, a subject of the King ofDenmark, residing at Copenhagen, Denmark, have invented Improvements inSteam-Boilers, of which the following is a specificais that thewaterpver the top of the firebox is insufiicient, whereas over the firetubes it is too deep and thus reduces the steam space.

Figures 1 and 2- of the accompanying drawings illustrate verticalsections at right angles to each other of the firebox and of alocomotive boiler constructed in accordance with this invention with theobject of obviating these disadvantages.

The top of the firebox is formed by a box B fastened to the tube plateP, the cylindrical barrel of the boiler extending from the other side ofthe tube plate I. A box 1) stayed in the usual manner and extending downfrom the box B forms the front of the firebox, and the sides of same areformed by means of water tubes t, t, t issuing from and returning to thebox b. These tubes are of I! or shape, and the ends'of their lower andupper nearly or more or less horizontal branches t and t are expanded inthe box b; and the more or less vertical parts t of the tubes join thebranches t and The water enters the lower tubes t and is lifted in thenearly vertical tubes t on account of the reduced specific gravity ofthe mixture of steam and water created in these, tubes through which astrong circulation is consequently set up when they are heated, thesteam bubbles rising and drawing the water after them. The plate isstouter where the tubes t and t are expanded into it, and outside thesetubes are plugs p which can be removed to enable the tubes to beexpanded, and partially cleaned. The weight of the tubes t, t, t iscarried partly by an angle iron between the box b and the tube plate, asseen on Fig. 2.

The tubes t, t t are kept in place and also partly carried by a bar,shown in dotted lines on Fig. l and in full lines onFig. 2.

In ordinary locomotive boilers, furthermore, it is especially the hotflat stayed inner sides of the firev box that connect the tube platewith the front of the 50.

firebox which cause troublesome strains, which strains are in presentconstruction eliminated as in place of these sides there are providedthe tubes t, 1 t which have no connection with the tube plate.- Besidesthose shown, other shaped tubes (or out and return tubes) may issue fromthe box b to increase the heating surface. The described arrangements donot either,

Specification of Letters Patent.

Application filed April 2,1906- Serial No. 309,642.

Patented July 2, 1907.

as in ordinary constructions, detract from or curtail the area of thetube-plate destined for holding the fire tubes of the barrel. The samenumber of fire-tubes,

therefore, can be placed further apart with greater water space betweenthem.

In order to provide sufficient depth of water above the firebox and atthe same time obviate excessive depth of water above the fire tubes inthe barrel, water tubes T are introduced between the lower part of thewater space of the barrel'ot' the boiler and the box b b or B, the waterlifting power of the tubes T due to the reduced specific gravity of thewater and steam in them when heated being sufiicient to lift the watersay' about two feet. These tubes T may be given a sufficient curvatureto provide elasticity for taking up the strains caused by the heat. Aweir or flange E prevents the water from returning to the cylindricalboiler until the water over the bottom of the box B reaches the heightof this weir or flange E, which, as seen on the drawing, is formed bybending up the bottom of the box B and is riveted to the tube plate P.When desired, the said weir or flange E can be raised by an additionalthin plate. In case of a double set of tubes T, the height of the waterline over the bottom of the box B depends on those tubes T which areleast heated. If the Weir or flange E be very high and outer and innerrows of tubes T be provided, the outer tubes being more strongly heatedthan the inner the water may ascend in the outer strongly heated tubesand descend,

through the inner. As will be seen, when no firing takes place the waterlevel in the box B and in the cylindrical boiler will be the same.

In ordinary locomotive boilers, the weir or flange E must be carriedright round the top, or the top be made cup shaped in other suitablemanner. By this arrangement, when the feed water is introduced in thecoldest part of the cylindrical boiler, then the coldest gases will acton the coldest water and the flame on the hottest water over the fireboxtop. It will be seen that the water level over the bottom of the box 13is kept automatically to the height of the weir or flange E as 1. In asteam boiler of the locomotive type, a chamber above the firebox, a weiror flange dividing said chamber from the barrel of. the boiler, and achamber depending from said first mentioned chamber and forming thefront of the firebox.

2. In a steam boiler of the locomotive type, a chamber above thefirebox, a weir or flange dividing said chamber from the barrel of theboiler, a chamber depending from said first mentioned chamber andforming the front of the firebox, and water lifting tubes connecting thewater space of the chamber above the firebox with the lower part of thewater space of the boiler barrel.

3. In a steam boiler of the locomotive type, a chamber above the fireboxdivided from the barrel of the boiler, a chamber depending from saidchamber and forming the front of the firebox, tubes forming the sides ofthe firebox and each connected to said depending chamber at differentlevels, and water tubes connecting the water space of the chamber abovethe firebox with the lower part of the water space of the boiler barrel.

4. A firebox for a steam boiler of the locomotive type comprising acrown sheet above which a chamber is formed, a back tube plate carryingthe boiler tubes. 11 water chamber depending from the chamber above thefire box and forming the front of the firebox, and rearwardly extendingbent water tubes forming the sides of the firebox, the two ends of eachof the said tubes being connected to the said water chamber at the frontof the firebox at different levels, as set.forth.

. 5. in a steam boiler of the locomotive type a chamber above the firebox having steam and water communication with the boiler barrel, a weiror flange dividing the water space of said chamber from the water spaceof the barrel of the boiler, a water chamber depending from said first 4mentioned chamber and forming the front of the firebox,

and water lifting tubes passing through the firebox connecting the waterspace of the chamber above the firebox and the water space of thedepending chamber with the lower part of the Water space of the boilerbarrel, an upward water current through the said tubes being createdcausing the water in the chamber above the firebox to fiow over the saidweir and back to the lower level of the water in the barrel.

6. in a steam boiler of the locomotive type a chamber above the fireboxdivided from the barrel of the boiler, a chamber depending from chamberand forming the front of the firebox, and out and return water tubesforming the sides of the firebox and each proceeding from and connectedto said depending chamber at diiferent levels.

7. A firebox for a steam boiler of the locomotive type comprising acrown sheet above which a chamber is formed, a back tube plate carryingthe boiler tubes, a water chamber depending from the chamber above thefirebox and forming the front of the firebox, and rearwardiy extendingbent, water tubes proceeding from'said depending water chamber andforming the sides 'of the firebox.

the two ends of each of the said water tubes being connected to the saiddepending water chamber at the front of the firebox at differentieveisfand tubes through the firebox, which tubes when heated cause thewater in the upper chamber to rise until it flows over a weir and backto the lower water level in the barrel of the boiler.

Signed at Copenhagen, Denmark this seventeenth day of March 1906.

iIENRiK CHRISTIAN VOGT.

Witnesses A. Rl l'EllWIN, H. G. V. PETERSEN.

